Door threshold



FIG. 1 is a perspective view of a door threshold showing my new design, with a center portion broken away to disclose indefinite length;

FIG. 2 is an end view thereof, the opposite end view being a mirror image;

FIG. 3 is a front view thereof; and

FIG. 4 is a top view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design of a door threshold, as shown and described. 